TY  - BOOK
AU  - BLACK, Uyless D
AU  - 
TI  - Data networks: Concepts, theory and practice
SN  - 0131984667
U1  - 004.6 
PY  - 1989///
CY  - NEW YORK
PB  - PRENTICE-HALL
KW  - INTERFACING AND COMMUNICATIONS
ER  -